Mystery?

Alright, dear readers, I am actively trolling for the next advanced-level middle grade mystery to put on my reading list. As you know, Ada and I recently completed the Echo Falls series, by Peter Abrahams:

It’s so freaking good it’s hard to imagine that any other mystery could come close. But all book lovers know this is nonsense, and there is a never-ending supply of excellent books to read in any genre. So! Write in with your suggestions! I can’t wait to hear them.